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RTK, PPK & Ground Control: The Aerial Advantage Guide
How a drone map actually reaches centimeter accuracy, in plain English. The three methods, the absolute-vs-relative accuracy idea most people miss, and how to tell a verified number from a spec-sheet claim. Written by an airline captain who flies the missions himself.
Scott WallaceAirline Captain & FAA-Certificated Remote PilotUpdated July 4, 2026
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What's inside
- Why a drone map floats meters off without corrections
- Absolute vs. relative accuracy, the idea that protects you
- RTK, PPK, and ground control points, side by side
- What each method costs in field time and hardware
- Independent checkpoints: accuracy you can prove, not just trust
- Which method fits construction, roofs, golf, and volumetrics
- The honest line: where a licensed surveyor is still required
- The questions to ask any drone mapping provider
Who it's for
- Construction and earthwork teams whose numbers ride on the map
- Property and facility managers comparing drone data providers
- Anyone who's been quoted 'centimeter accuracy' and wants to verify it
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